A rectangular board has a length of 15cm and width x cm. If its sides are doubled, find its new area.
A.
60x cm\(^2\)
B.
45x cm\(^2\)
C.
30x cm\(^2\)
D.
15x cm\(^2\)
Correct answer is A
New are = (2 x 15) x (2 x \(x\))
= 60cm\(^2\)